i want more bass out of my system without adding much wieght. no big sub, box, and amp combo. So can i put a 8 inch rockford fosgate in the stock JBL audio box? who alls done this tell me what you did. ive heard a new head unit add a little bass but all the head units i like have cd players and mine has a seprate cd player. new speaker that can handle lower tone might help, any speaker sugestions? whats the jbl speaker size? also can i put a bigger amp on the 8 inch RF if i do that? what size and can it fit in the stock location? i want as much trunk space as possible. i also want the system to look stock, but not sound stock. thanks for any sugg.